--- O30.211 Quadruplet pregnancy with two or more monochorionic fetuses, first trimester

--- O30.212 Quadruplet pregnancy with two or more monochorionic fetuses, second trimester

--- O30.213 Quadruplet pregnancy with two or more monochorionic fetuses, third trimester

--- O30.219 Quadruplet pregnancy with two or more monochorionic fetuses, unspecified trimester